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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059e4b2b7e4981cfa74d0ef9844fe22140a983039cb05df3e1eb0269ce5a5165' 
  AND token = 'lhnW5FzhfHAVL/6k1eSWS8HieuXdLts0MoamLgDf0CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}